Process of attaching retreads to worn tire casings



UNITED ESPAT N wE-,

WILLIAM VE.,SHAWGER, oF'Los ANGELES, CALIIFORNIA, AssIeNoa'To GEORGE w. ENO- RUBBER COMPANY, OF LOS ANGELES, GALIFQBNIA, A CORPORATION OF CALI FOBNIA.

PROCESS Manama-immune To wean "TIRE stem "170 Drawing.

T 0 allwhom may concern:

Be it known that LVVILLIAM E. SHAWGER, a citizen of the United States, residing at Los An'geles, :in the county of Los A-ngel'es and State of California, have invented new and useful Improvements in Processes of Attaching Bet-reads toorn Tire Casings, of which'the following is a specific'a tion; 1 Y a My invention relates-toe process of applyinga retread to the worn outer surface of worn pneumatic vehicle t-1res-,-and uniting the parts together to form an inte'graltire,

which will greatly lengthen"the Wearing qualities of the worn tires.

In the process of uniting a retread to the worn'tread of a worm ft'ire, it has heretofore been customary to first properly prepare the tread of the worn tire, then coat-its outersurface with a suitable: c'ement,'*then apply a coating of gum-ever this cement surface.

The inner'surfa'ce of the retread member is" usually coated with cement, and 'saicl=-r'e tread is then forced over theouter surface of the worn tire. When these elements are properly assembled, the wholetire is sub jected to heat at 'apropjer temperature and vulcanized together. r r 1 During the operation of stretching the retread member over the tread of the worn tire, in the above recited process, the inner surface of the retread member often times sticks to the outer surface of the worn tire tread, due to the frictional resistance, or adhesive tendency, of the gum which is interposed therebetween, to such an extent that great force and the expenditure of an excessive amount of time is required to assemble these elements together in proper adjust ment preliminary to the vulcanizing process.

Itis the object of my present invention to overcome the above mentioned difficulty by applying a substance, preferably in the form of an anti-frictional powder to the surface of the gum which is interposed between the tread of the tire and the retread member,

whereby the frictional or adhesive pro stance being oj such nature as to melt and form an integral part of the other elements during a vulcanizlng process,

Specification of Letters Patent.

in-g'specific stepsin my process haveproven very efiicient. The worn tire is properly prepared" by strippirfg from the outer surface thereof all-of the remaining-rubber portions, and then J'tlIOI-OUJghlY buffing and cleaning-said surface. This surface tisgthen covered with three coatsof cement, each coat a being allowed to thoroughly dry before the next "succee'd' in g c'oat is applied. After-the cemfent is :dry, a :sheet of cushion coats of cement are applied theretolandal-q lowecl'to dry in a similar manner to that on the t re surface. I l

" The surface of v the cushion I Patented Mar, 14, 19,2 2.

Application filed Septemb'er20f192b. 'sei'iai nai igeilb rubber is applied to this cement surface. '7

gum and-the" inner surfa'ce of tlie retread" member are both lightly covered withala thinscoa'ting' of:

a substance preferably of an antifrictional nature,'said substance being of s'uchcharacter as to meltjat a te-mperafture 'Iof approxi i mately 280 degrees Fahrenheit: I have found that many metallic gaseous and liquid sub;- stances such as sulphur antimony "sulphides;

aniline, for-nialdehyde 'etc. -*a1-"e admirably adapted for this :pu-rp'ose, and" that afcon i venient and efficient way of applying the same is to form the substance into a fine After the elements have been assembled as is above described, the whole assembled tire is subjected to a vulcanizing process,thus causing the powdered substance, as well as the.

cushion gum to melt and become an integral part of the other members, thus producing a retreaded tire having substantially the same efliciency as a new one.

What I claim is 1.-The herein described process of retreading Worn vehicle tires, comprising coating the outer surface of the tire and the inner surface of'the tread with a liquid cement, applying a layer of gum t0 the surface of the worn tire, covering the surface of the gum with a substance which will-melt during a vulcanizing process; then applying thetread to the tire, and finally subjecting the whole to a vulcanizing process to unite the re-tread to the surface of the worn tire.

'2. The herein described process of retreading worn vehicle tires, comprising coating the outer surface of the worn tire and the innersurface of the re-tread with a liquid cement, then applying a layer of adhesive gum to the worn tire, then covering the surface of the gum with a mineral substance which will melt at a temperature of approximately 280 "degrees Farhenheit, then applying the re-tread to theworn tire, and finally subjecting the whole to a vulcanizing process.

3. The process ofv applying a retread to a worn tire, which consistsof applying to the outer surface of the worn tire and the inner surface of the re-tread, a'plurality of coatings of cement, and allowing each coat toidry before applying the next succeeding coat, then applying a layer of cushion gum t0 the outer surface of the worn tire, then applying a mineral powder to the surface of said layer of gum and the inner cement coated surface of the re-tread, then applying the re-tread to the tire, and finally subjecting the whole to a vulcanizing process.

4. The process of applying a re-tread to a Worn tire which consists in removing all of the Worn rubber from the surface of said tire and thoroughly bufling and cleaning the outer surface of the worn tire, and the in- .ner surface'of the re-tread, then applying to the outer surface of the worn-tire and the inner surface of the re-tread a plurality of coats of liquid cement and allowing each coat to dry before applying the next succeeding coat, then applying a sheet of cushion rubber to the worn tire surface, then dusting the inner cement coated surface of accidental sticking of the retread member when applied to worn tire, applying the retread to the worn tire and finally vulcanizing the members together to form an .integral .55

mass. I

6. The herein described process :of retreading worn vehicle tires,-,comprising the application of a layer of cushion gum to the tread surface of the worn tire, covering the;

surface of the gum with a mineral powder to prevent accidental adhesion of the re-tread member when applied: to the worn tire, ap-' plying the retread to the worn tire, and finally vulcanizing the-re-treaded tire.

7 The herein described process of re treading worn vehicle tires comprising the application of-an adhesive substance to the; outer peripheryv of the worn tire, coating the: adhesivesubstance with a substance'that will:

701 tread member is applied to the worn tire, the v.- said substance possessing the quality of melt-5 prevent, accidental adhesion when the reT ing at a vulcanizing temperature, and finally vulcanizing the re-tread memberto the worn In. witness that. I claim the foregoing-11 tire.

have hereunto subscribed .my name.

WILLIAM .SHAWGER; 

